A study looking at almost 30,000 women who were struggling to get pregnant found that tumours were more common in the group that had undergone IVF.
Scientists believe the difference is down to the hormone drugs that make women produce more eggs.
They say that further research into couples who have several years? worth of assisted reproduction could lead to a recommendation that they stop IVF after more than three cycles, because of the increased danger of disease.
It comes just days after figures from Britain?s fertility watchdog showed that some women are producing as many as 80 eggs in a single session, prompting claims that this ?intensive farming? is putting them at increased risk.
Lead researcher Prof Flora van Leeuwen, of The Netherlands Cancer Institute, Amsterdam, said: ?If we find out that women who receive several IVF cycles or large doses of ovarian stimulating drugs are at a greater risk of ovarian cancer, then these women would need to be informed about these risks when continuing IVF treatment and possibly advised to discontinue treatment after three to six cycles (depending on which number of cycles would be associated with the high risk of ovarian malignancies).?
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